Abstract
The full characterization of the optical properties of nanofluids consisting of single-wall carbon nanohorns of different morphologies in aqueous suspensions is carried out using a novel spectrophotometric technique. Information on the nanofluid scattering and absorption spectral characteristics is obtained by analyzing the data within the single scattering theory and validating the method by comparison with previous monochromatic measurements performed with a different technique. The high absorption coefficient measured joint to the very low scattering albedo opens promising application perspectives for single-wall carbon nanohorn-based fluid or solid suspensions. The proposed approximate approach can be extended also to other low-scattering turbid media.PACS: 78.35.+c Brillouin and Rayleigh scattering, other light scattering; 78.40.Ri absorption and reflection spectra, fullerenes and related materials; 81.05.U- carbon/carbon-based materials; 78.67.Bf optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures, nanocrystals, nanoparticles, and nanoclusters.
Highlights
Single-wall carbon nanohorns [SWCNHs] are carbon nanostructures belonging to the family of carbon nanotubes
We propose a spectrophotometric method for the spectral evaluation of the scattering albedo of SWCNH aqueous suspension
The spectral extinction coefficient of an undiluted suspension of SWCNHs is calculated for the two considered morphologies as described above
Summary
Single-wall carbon nanohorns [SWCNHs] are carbon nanostructures belonging to the family of carbon nanotubes. The SWCNHs assemble to form roughly spherical aggregates with typical diameters of about 100 to 120 nm with three characteristic morphologies: dahlia-like, bud-like, and seed-like [3]. They exhibit both a large surface area and a large number of cavities [4] and appear promising for a large variety of applications, including gas storage [5], drug delivery, [6] and solar energy [7,8]. The low albedo values measured could open interesting perspectives of applications for this kind of nanomaterial in other different fields
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